Hair rollers are cylindrical tools used to create curls or waves in hair. They come in various sizes and materials, such as foam, plastic, or velcro, allowing users to achieve different styles. To use hair rollers, individuals typically section their hair, wrap it around the roller, and secure it in place. The rollers can be left in for a few hours or heated for quicker results. Once removed, hair rollers can give hair volume and texture, making them a popular choice for styling. They are often used in conjunction with styling products like hairspray to help maintain the curls. Hair rollers are suitable for various hair types and lengths, making them a versatile styling tool.